R. Crumb - Undergound Comix Genius

Zap Comix author and illustrator Robert Crumb has become a cult hero to a hard core legion of comic book fans ever since he became sort-of famous on the 1960s.
The movie "Crumb" is also a fascinating piece on a talented dysfunctional family - directed by Crumb fan/friend Terry Zwigoff.
A few questions of the life of Crumb.